for a in $str ; do

for arg in $* ; do
	
idone

while test $# -ft 0 ; do
	echo $1
	shift 1
done 

while [ $# -ft 0 ]; do

for arg ; do
	echo "$arg"
done

./1.sh a b c "a b c"
.
for arg; do
	if test -f $arg ; then 
		echo du -b $arg
	fi
done 

du 1.sh

if [ $# -ne 1] ;then
	echo "The script must receive a single character"
	exit 1
fi

if [ ! -d 1] ;then
	echo "The script must receive a single character"
	exit 1
fi